/* 案例 */
        #banner{
            position: relative;
            overflow:hidden;
        }

        #list{width: 200px; height: 50px; position: absolute; right:50px; bottom:20px;}

        #list .item{width: 8px; height: 8px; background-color: rgba(0,0,0,0.1); border-radius:100%; float:left; margin-right: 10px; border:2px solid rgba(0,0,0,0.3)}

        #list .item:hover{background-color: rgba(255,255,255, 0.5); border-color:#333;}